A:
Positive:
1 x 309810055 x 619620111 x 281645555 x 563291167 x 185515835 x 371031837 x 168653373 x 9185
Negative:
-1 x -30981005-5 x -6196201-11 x -2816455-55 x -563291-167 x -185515-835 x -37103-1837 x -16865-3373 x -9185
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 30,981,005, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 30,981,005 | |
| -1 | -30,981,005 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 30,981,005.
Example:
1 x 30,981,005 = 30,981,005
and
-1 x -30,981,005 = 30,981,005
Notice both answers equal 30,981,005
With that explanation out of the way, let's continue. Next, we take the number 30,981,005 and divide it by 2:
30,981,005 ÷ 2 = 15,490,502.5
If the quotient is a whole number, then 2 and 15,490,502.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 30,981,005 | |
| -1 | -30,981,005 |
Now, we try dividing 30,981,005 by 3:
30,981,005 ÷ 3 = 10,327,001.6667
If the quotient is a whole number, then 3 and 10,327,001.6667 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 30,981,005 | |
| -1 | -30,981,005 |
Let's try dividing by 4:
30,981,005 ÷ 4 = 7,745,251.25
If the quotient is a whole number, then 4 and 7,745,251.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 30,981,005 | |
| -1 | 30,981,005 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 167 | 835 | 1,837 | 3,373 | 9,185 | 16,865 | 37,103 | 185,515 | 563,291 | 2,816,455 | 6,196,201 | 30,981,005 |
| -1 | -5 | -11 | -55 | -167 | -835 | -1,837 | -3,373 | -9,185 | -16,865 | -37,103 | -185,515 | -563,291 | -2,816,455 | -6,196,201 | -30,981,005 |
Here are some more numbers to try:
Try the factor calculator